not know your arse from your elbow

BRITISH, INFORMAL, VERY RUDE or

not know your ass from your elbow

mainly AMERICAN, INFORMAL, VERY RUDE

If someone doesn't know their arse from their elbow, they are stupid or they do not know anything about a subject or situation. I won't be lectured to by some producer who doesn't know his arse from his elbow. Note: In British English, your arse is your bottom. In American English, the word used is ass.

not know your arse from your elbow

not know your ˌarse from your ˈelbow

(British English) (American English not know your ˌass from your ˈelbow) (taboo, slang) be very stupid or completely lacking in skill: Don’t ask him to organize things! He doesn’t know his arse from his elbow!

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